Navi Sprite and Stone Sprite will visit you the day after you reach Lv.9 in the Mining Skill. The cutscene will occur right after leaving your house.
Activities
The main activity on Stonebreaker's Island is mining various stones that spawn on it. You can find any of the stone and ores you find in your farm's three mines here. Orichalcum spawns here as well, giving you a way to obtain the ore without going into the depths of Mine 3. The rocks take a few days to respawn, but if you give it long enough, almost the entire island will be covered in a variety of rocks to break. Having a well-upgraded hammer will make clearing off the island easier.
The ores and stone obtained here can be used for various crafts, or you can feed the ores to the Ingot Maker and raw diamonds to the Gem Maker to get materials with more use. You can find Common Mushroom here as well, which can be shipped or used for cooking recipes.
Items to Obtain
Type of Ore
Stone
Iron Ore
Silver Ore
Gold Ore
Orichalcum Ore
Raw Diamond
Other Items
Common Mushroom
References
All information not credited to persons on this page or below are referenced from the official guide.[1]
↑牧場物語オリーブタウンと希望の大地 公式ガイドブック, Bokujou Monogatari Oriibutaun to Kibou no Daichi Koushiki Gaido Bukku [Bokujou Monogatari Olive Town and the Land of Hope Official Guide Book]. 1st Ed. (2021). Kadokawa Game Linkage.
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Blaire ・ 
Bridget ・ 
Damon ・ 
Emilio ・ 
Iori ・ 
Jack ・ 
Laura ・ 
Linh ・ 
Ralph ・ 